It is common for azoospermia to be associated with other diseases. As a matter of fact, obstructive and non-obstructive azoospermia typically appears as a consequence of other genetic or anatomical diseases.
Although there exist many diseases that can cause azoospermia, we are going to introduce you to the most common ones in the following sections.
The different sections of this article have been assembled into the following table of contents.
There exist different chromosomal and genetic abnormalities that can lead to male infertility, whether it is caused by obstructive or non-obstructive/secretory azoospermia. Some of the most common ones are:
Klinefelter syndrome is a chromosomal abnormality that causes males to have a 47,XXY karyotype instead of the normal 46,XY karyotype in males.
Most males with this abnormality have secretory azoospermia, as this chromosomal abnormality causes a hormonal imbalance that affects spermatogenesis (sperm production) negatively. Moreover, in case sperm are produced, they are likely to be aneuploid, that is, there are higher chances for them to have chromosomal alterations.
Depending on the level of severity, the effects of this sperm disorder on fertility can be more or less serious.
Y chromosome microdeletion
Chromosome Y, responsible of male sex differentiation, contains unique genes that are involved in sperm production. The loss of small portions of the area containing these genes, known as AZF region, can lead to a lack of some of these genes, thereby affecting spermatogenesis directly.
Between 10-15% of the cases of non-obstructive azoospermia are due to Y chromosome microdeletion.
It is an Y-linked genetic disease that alters the function of the hypothalamus, leading to hormonal irregularities. As a result, spermatogenesis is compromised. This is the reason why males with this disorder are infertile.
Cystic fibrosis (CF) is a hereditary genetic disease that affects the pancreas and the lungs. Moreover, CF can cause infertility issues.
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CF is one of the most common genetic diseases in Caucasian people. In fact, 1 out of every 25 persons is a carrier of the CFTR gene mutation, the causal agent of this disease.
About 10% of males with obstructive azoospermia were born lacking both vasa deferentia, which means that they do not have the ejaculatory ducts in charge of transporting sperm from the testes to the urethra. Of these patients, about 70% have CF or are carriers of the genetic mutation that causes it.
Being a carrier of a genetic disease does not mean the person is sick. However, it is likely that offspring inherits it.
Chronic renal insufficiency
Chronic renal insufficiency (CRI), also known as chronic kidney disease (CKD), is defined as the progressive and permanent loss of renal activity. It can affect the hormones that cause sperm production severely.
Increased prolactin, FSH, and LH levels, along with decreased testosterone levels, affect spermatogenesis directly, which can cause azoospermia in the most severe cases.
A varicocele is a dilation of the spermatic veins, the set of vessels that nourish the testicles so they are able to produce sperm.
In the most severe cases of varicocele, it can have a negative impact on spermatogenesis and even prevent their production, which causes non-obstructive azoospermia. However, a varicocele can cause obstructive azoospermia, too.
More on this article: What Is a Testicular Varicocele?
There exist certain childhood diseases than can compromise the adequate development of the male reproductive tract, causing non-obstructive azoospermia during adulthood due to an inflammation of the testicles (i.e. orchitis).
A good example of this type of diseases is epidemic parotitis, commonly known as mumps. This condition causes mumps orchitis (testicular infection caused by the mumps virus).
Other childhood diseases that can cause diseases in the male reproductive tract are orchitis and meningitis, high fever or certain severe infections (for example, the one caused by the Chlamydia trachomatis bacterium).
Cryptorchidism is an anomaly of the male reproductive tract that prevents the testes from descending from the scrotum. As a result, they can remain trapped in the abdominal cavity or the inguinal canal. If cryptorchidism is not treated during childhood, it can lead to permanent infertility, increasing the risk of testicular cancer.
During embryo development, the testes descent through the inguinal canal into the scrotum. Right after childbirth, they are found in the scrotum.
This situation allows the testes to be at a temperature that is about 2 °C below the temperature of the rest of the body. These conditions are necessary for spermatogenesis to occur adequately. For this reason, undescended testicles (located in the pelvic cavity) are a cause of non-obstructive azoospermia).
It can be described as a malignant proliferation of cells in the testis. Damage caused on the testes can compromise sperm production, causing azoospermia.
The most common symptoms of testicular cancer include inflammation of the area (orchitis and/or epididymitis), a rare testicular mass, pain, scrotal swelling, etc. Although these symptoms may be due to other conditions, we recommend that you visit your doctor.
FAQs from users
Can genetic azoospermia be cured?
Genetic diseases such as Klinefelter Syndrome or Kallmann Syndrome do not have a cure, although there exist symptoms that can relieve or improve the qualify of life of these patients. For example, there are hormonal replacement therapies or surgical procedures that can help eliminate azoospermia when it is caused by any of these diseases.
Can stress cause azoospermia?
Yes, situations that increase anxiety or stress levels can alter the hormones that regulate sperm production, causing zero sperm count. However, these are situations of temporary azoospermia that allow the affected man to recover fertility after returning to normality. In other words, as soon as increased stress levels decrease and the man is more relaxed, sperm production starts anew and azoospermia disappears.
Suggested for you
These diseases can be the cause of azoospermia, but there exist other situations like trauma or certain surgical procedures that can lead to zero sperm count. Want to learn more about the potential causes of this sperm disorder? Check them out here: What Are the Causes of Azoospermia?
Also, we have made reference to several diseases. To learn more about each one of them, you can visit this post: Testicular Disorders & Infertility – Impact on Reproductive Function.
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